<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>这是个标题</title>

    <style>
        h1 {
            color: #ff0000;
        }
    </style>
    <script>
        var show =function () {

            alert("你们真的看得懂码?")

        }
    </script>
</head>
<body>

<h1 >啦啦啦啦啦啦,追不上我吧</h1>

<button onclick="show()">这是个按钮啊</button>


<input type="text" placeholder="请输入用户名">
<br>
<input type="password" placeholder="请输入密码">

</body>
</html>